ENGEL JAMES F. (1995). CONSUMER BEHAVIOR (7TH.). DRYDEN PRESS.
Lua i Stíl Chicago (17ú heag.)ENGEL JAMES F. CONSUMER BEHAVIOR. 7TH. FORTH WORTH: DRYDEN PRESS, 1995.
Lua MLA (9ú heag.)ENGEL JAMES F. CONSUMER BEHAVIOR. 7TH. DRYDEN PRESS, 1995.
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